American Hometec.

The C10 electric tankless water heater features coil-less technology, which heats water indirectly with quartz tubes; because electric components are not in direct contact with the water, lime-scale buildup is eliminated, says the company, increasing durability and helping to maintain a 95% to 99% efficiency. Three capacity settings provide adjustable power consumption; it has a rise of 0.4 to 1.3 gpm. The C10 is the first in a line of coil-less electric and Energy Starcertified gas models. 877.662.6457. www.americanhometec.com.